He knows he's throwing Shadow for a loop now that he's actually taking some of the initiative to proceed with these sorts of urges. It was pretty obvious that the hedgehog had wanted to some time ago, but he couldn't bring himself to follow through with it.
His ears flick at the little sounds that Shadow makes, trying to listen to see if there was anything that he should worry about in terms of pushing the younger hedgehog too far. He can tell that Shadow doesn't know what to do with himself, so he lets his hands pet along the boy's sides - rubbing and just making him feel nice and warm as he licked at that throat~